Schottky Effect for SrO Films on Molybdenum

The Schottky effect and the periodic deviations about the Schottky line have been simultaneously investigated for thin films of SrO on molybdenum. The experimentally determined Schottky slope is in good agreement with the theoretical value of $e^{\frac{3}{2}}\mathrm{kT}$ for deposits less than a monolayer; but becomes larger than theory for more than a monolayer. The periodic deviations obtained for a clean molybdenum surface wash out when as little as $\frac{1}{60}$ monolayer of SrO is deposited on the surface. The implication is that the electron reflection coefficient near a Mo-SrO surface cannot be associated with the simple $\mu$ reflection found for clean metals.